DOCSLIB.ORG

The Washburn Observer

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
The Washburn Observer The Washburn Observer Volume 3, No. 2 • Fall 2013 • www.astro.wisc.edu New Faces in the Department This Fall Inside This Issue he Astronomy Department welcomes the Charee Peters has an MA degree incoming 2013–14 class of graduate students, in physics from the Fisk-Vanderbilt Letter from the Chair 2 T visiting faculty and postdocs. Masters-to-PhD Bridge Program and a John Chisholm Bitten by BS degree in physics from the University Astronomy and Travel Bugs 3 Elijah Bernstein-Cooper has a BS degree in phys- of Denver (Colorado). She is working with Professor Eric Wilcots on observing SKA Pathfinders: A Bright ics, with an astronomy emphasis, from Macalester Radio Future 4 College in St. Paul, Minnesota. He is working with HI regions (interstellar clouds of neutral Professor Snezana Stanimirovic to answer what hydrogen) in intermediate galaxies to Department Welcomes better understand star formation, galaxy Second Grainger Fellow 5 role atomic hydrogen plays in the formation of molecular hydrogen in giant molecular clouds. formation and evolution, and/or cosmic Solar System’s in Good magnetic fields. Hands with Anne Kinney 6 Yi-Hao Chen has an MS degree in astrophysics For Garret Frankson, from Ludwig-Maximillian University in Munich, Brianna Smart has a BS degree in astron- Astronomy Is a Passion 6 Germany and a BS degree in physics from National omy and physics from the University of Arizona in Tucson. She is working with News Notes 7 Taiwan University in Taipei. He is working with Professor Sebastian Heinz on studying the effect senior scientist Matt Haffner on studying of magnetic fields on propagation of jets from the ISM using the Wisconsin H-Alpha compact objects. Mapper (WHAM). Tim Haines has a BS Andrea Vang has a BA degree in physics degree in physics, from Carleton College in Northfield, mathematics and Minnesota. She is working with senior computer science, scientist Marsha Wolf on observations of with an electrical and post-starburst galaxies. computer engineer- ing emphasis, from Associate Professor Tony Wong from the University of the Department of Astronomy at the Missouri in Kansas University of Illinois at Urbana-Cham- City. He is working paign is a fall sabbatical visitor. He has with Professor Elena previously held research positions at the D’Onghia on using Australia Telescope National Facility graphics processing and the University of New South Wales. The incoming 2013–14 class of graduate students: from left, Yi-Hao Chen, units to increase the He primarily studies the interstellar Charee Peters, Stephen Pardy, Elijah Bernstein-Cooper, Andrea Vang, Brianna speed and resolution medium (ISM) in nearby galaxies and its Smart, and Tim Haines of both cosmological- relation to star formation. Specifically, scale and galactic-scale simulations. his research interests include the global structure of the ISM in disk galaxies, Stephen Pardy has a BS degree in physics from studies of the ISM in the Large Magel- Macalester College in St. Paul, Minnesota. He is lanic Cloud, and molecular line mapping involved in projects on the atomic and molecular of GMCs in the galaxy. Born in Law- ISM in galaxies. He is working with Professor rence, Kansas, he is a U.S. and Austra- Elena D’Onghia. lian citizen. He received an MA Continued on page 5 The Washburn Observer Letter from the Chair explores the interaction between ionized Enjoy the rest of this newsletter, and gases and electromagnetic fields in both best wishes for the fall season. astrophysical and laboratory settings. We overlap with the Mathematics, Statistics, and Computer Science Depart- ments through gas dynamics, plasma Ellen Zweibel physics, handling of large data sets, and Astronomy Department Chair innovations in hardware. We share an interest in planets — here in the solar system and orbiting other stars — with Make a Gift: the Atmospheric and Oceanic Sciences If you wish to make a and Geoscience Departments. Our popu- tax-deductible gift to the lar Life in the Universe course (Astron- Department of Astronomy omy 160) — team-taught by astronomy, Fund, which allows the department biology, and geology faculty — is just to support special opportunities one example of how interdepartmental for students, staff, and faculty, you synergism helps to enrich the campus. can contribute online at www. In the next few years, we’ll be discussing astro.wisc.edu (click on Friends & Alumni, Make a Gift) Ellen Zweibel, Astronomy Department Chair options for broadening our undergradu- ate major to give our students more or he start of the fall semester always opportunities to study and work at the send a check, payable to the UW Foundation, to: UW Foundation, brings a surge of energy, and for the boundaries of different disciplines. Allied T US Bank Lockbox 78807, Milwau- UW Astronomy Department this year, a programs in the School of Education help kee, WI 53278-0807. sense of newness. We have a new depart- us to educate more effectively, and to ment chair (me), a new dean (John Karl help our graduate students become Questions may be directed to Scholz), and a new chancellor (Rebecca better educators. Department of Astronomy Profes- Blank). The latter two are economists, We have bonds with other Wiscon- sor Bob Mathieu, mathieu@astro. and I am a theoretical astrophysicist with sin institutions as well. Three faculty wisc.edu, (608) 890-3767 or UW a specialty in plasma astrophysics. members from other UW campuses have Foundation Director of Develop- Though just a few months into my visitor appointments that bring them ment Chris Glueck, chris.glueck@ three-year term as chair, I already have to the department regularly, and we’re supportuw.org, (608) 265-9952. much to learn. The overarching goal is launching an astronomy course taught Thank you for your support! simple. My job is to help the Astronomy jointly with faculty at the College of Department do its job — the best re- Menominee Nation (CMN) in Keshena search, teaching, and outreach that we’re that will be open to CMN and UW capable of doing. We have great ingredi- students alike. Please Keep in Touch: ents: telescopes, computers, coffeemakers Finally, academic exchanges are We’d like to hear from you. of every description, and above all, tal- great opportunities to broaden our scope. Please send any news we can ented and energetic people of all ranks — In addition to our weekly Colloquium include in future newsletters or any from undergraduates to senior scientists speakers and short-term visitors, this fall changes in your contact informa- tion to: [email protected] and faculty, supported by excellent staff. we’re delighted to host Maggie Turnbull, or UW-Madison Department of Our success is due in part to being an independent scholar who researches Astronomy, 475 N. Charter St., embedded in a great university. We’re methods for finding planets that can Madison, WI 53706, Attn: Barb connected to the Physics Department support life, and sabbatical visitor Tony Sanford. through our joint interests in high-energy Wong, a radio astronomer from the Uni- astrophysics, pursued through programs versity of Illinois at Urbana-Champaign And tell us if you prefer to receive an in cosmology, x-ray astronomy, the who works on star formation in other electronic copy of the newsletter. IceCube project, and the recently formed galaxies. Alex Lazarian and Bob Mathieu Like us on Facebook: Wisconsin IceCube Particle Astrophysics have returned from their sabbatical UW Madison Astronomy Department Center. We’re also connected to Physics leaves with fresh perspectives, while and the College of Engineering through Matt Bershady and Snezana Stanimirovic Follow us on Twitter: @uwastro the plasma physics program, which have just begun theirs. 2 John Chisholm Bitten by Astronomy and Travel Bugs ohn Chisholm is certainly not the first “Small-scale events like supernovae Idea, John enjoys outreach. For example, Jgraduate student to be bitten by both add energy to the surrounding interstel- he helped to run a summer program the astronomy and travel bugs. Nor is he lar medium, heating it up and stopping at Yerkes Observatory in Williams Bay, likely to be the last. stars from forming out of cold molecular Wisconsin, helping middle school stu- This past summer, John was one of gas,” he explains. “This ties in with the dents to build handheld telescopes and 29 visiting international students at the project that I’m doing now, looking at observe the moon and planets. One of Summer Institute in Taiwan. Under a cold molecular and hot ionized gas and the perks that came with the program: National Science Foundation (NSF) East seeing the connections and interactions “I lived in an old observing room and Asia and Pacific Summer Institutes for between the two.” He was awarded a got to play with the big telescope.” He U.S. Graduate Students (EAPSI) Fellow- Hubble Space Telescope grant for the core has also been an active participant in the ship, he worked with research fellow Sa- part of his thesis work on outflows and Universe in the Park program, which toki Matsushita at the Academia Sinica, the interaction of the temperature phases introduces people to telescope-views of learning how to do submillimeter data of outflows in many galaxies with a wide the night sky in Wisconsin state parks. “I reduction in his study of stellar feedback range of properties using the Hubble like to open people’s eyes to the wonders in the life cycle of gas. Cosmic Origins Spectrograph (COS). astronomy has to offer,” he adds. John also has the distinction of being Outside of work, John likes to stay the department’s only current gradu- “I like to open people’s eyes active. “I love hiking and camping in ate student who’s been to the Southern to the wonders astronomy Colorado, where my grandparents live.
Load more

Recommended publications
  • The Radio Astronomy of Bruce Slee
    CSIRO PUBLISHING Review www.publish.csiro.au/journals/pasa Publications of the Astronomical Society of Australia, 2004, 21, 23–71 From the Solar Corona to Clusters of Galaxies: The Radio Astronomy of Bruce Slee Wayne Orchiston Australia Telescope National Facility, PO Box 76, Epping NSW 2121, Australia (e-mail: [email protected]) Received 2003 May 8, accepted 2003 September 27 Abstract: Owen Bruce Slee is one of the pioneers of Australian radio astronomy. During World War II he independently discovered solar radio emission, and, after joining the CSIRO Division of Radiophysics, used a succession of increasingly more sophisticated radio telescopes to examine an amazing variety of celestial objects and phenomena. These ranged from the solar corona and other targets in our solar system, to different types of stars and the ISM in our Galaxy, and beyond to distant galaxies and clusters of galaxies. Although long retired, Slee continues to carry out research, with emphasis on active stars and clusters of galaxies. A quiet and unassuming man, Slee has spent more than half a century making an important, wide-ranging contribution to astronomy, and his work deserves to be more widely known. Keywords: biographies — Bruce Slee — radio continuum: galaxies — radio continuum: ISM — radio continuum: stars — stars: flare — Sun: corona 1 Introduction Radio astronomy is so new a discipline that it has yet to acquire an extensive historical bibliography. With founda- tions dating from 1931 this is perhaps not surprising, and it is only since the publication of Sullivan’s classic work, The Early Years of Radio Astronomy, in 1984 that schol- ars have begun to take a serious interest in the history of this discipline and its ‘key players’.
    [Show full text]
  • ROSAT Observations of Superflares on RS Cvn Systems
    ROSAT Observations of Superflares on RS CVn Systems Vito Giuseppe GrafFagnino Thesis submitted for the degree of Doctor of Philosophy, in the Faculty of Science of the University of London. UCL Mullard Space Science Laboratory Department of Space & Climate Physics U n i v e r s i t y • C o l l e g e • L o n d o n 2000 ProQuest Number: U642316 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. uest. ProQuest U642316 Published by ProQuest LLC(2015). Copyright of the Dissertation is held by the Author. All rights reserved. This work is protected against unauthorized copying under Title 17, United States Code. Microform Edition © ProQuest LLC. ProQuest LLC 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106-1346 ,,. A Mia Moglie E Miei Genitori A bstract The following thesis involves the analysis of a number of X-ray observations of two RS CVn systems, made using the ROSAT satellite. These observa­ tions have revealed a number of long-duration flares lasting several days (much longer than previously observed in the X-ray energy band) and emitting ener­ gies which total a few percent of the available magnetic energy of the stellar system and thus far greater than previously encountered. Calculations based on the spectrally fitted parameters show that simple flare mechanisms and standard two-ribbon flare models cannot explain the observations satisfacto­ rily and continued heating was observed during the outbursts.
    [Show full text]
  • Bibliography from ADS File: Byrne.Bib June 27, 2021 1
    Bibliography from ADS file: byrne.bib Foster, D. C., Byrne, P. B., Rolleston, W. R. J., & Hawley, S. L., “VRI photometry August 16, 2021 of the young open cluster IC 2602”, 1996ASPC..109..357F ADS Lanzafame, A. C. & Byrne, P. B., “Helium lines in late-type dwarfs.”, 1995A&A...303..155L ADS Zboril, M., Byrne, P. B., & Rolleston, W. R. J., “Erratum: Metallicity and pho- Keenan, F. P., Brekke, P., Byrne, P. B., & Greer, C. J., “The OV tospheric abundances in field K and M dwarfs”, 1998MNRAS.301.1104Z 1371.29A/1218.35A emission-line ratio in solar and stellar spectra”, ADS 1995MNRAS.276..915K ADS Short, C. I., Byrne, P. B., & Panagi, P. M., “The chromosphere of II Pegasi: multi- Barrado, D. & Byrne, P. B., “VizieR Online Data Catalog: BVRI CCD photom- line modelling of an RS Canum Venaticorum star”, 1998A&A...338..191S etry of NGC 5460 (Barrado+, 1995)”, 1995yCat..41110275B ADS ADS Vennes, S., Mathioudakis, M., Doyle, J. G., Thorstensen, J. R., & Byrne, P. B., Zboril, M. & Byrne, P. B., “Metallicity and photospheric abundances in field K “Discovery of a white dwarf companion (EUVE J0254-053) to the K0 IV star and M dwarfs”, 1998MNRAS.299..753Z ADS HD18131”, 1995A&A...299L..29V ADS Byrne, P. B., Abdul Aziz, H., Amado, P. J., et al., “The photosphere and chromo- Byrne, P. B., Panagi, P. M., Lanzafame, A. C., et al., “The photosphere and sphere of the RS Canum Venaticorum star, II Pegasi. II. A multi-wavelength chromosphere of the RS Canum Venaticorum star, II Pegasi I. Spots and chro- campaign in August/September 1992”, 1998A&AS..127..505B ADS mospheric emission in 1991.”, 1995A&A...299..115B ADS Theissen, A., Foster, D.
    [Show full text]
  • Bibliography from ADS File: Shibata.Bib August 16, 2021 1
    Bibliography from ADS file: shibata.bib Airapetian, V. S., Barnes, R., Cohen, O., et al., “Impact of space August 16, 2021 weather on climate and habitability of terrestrial-type exoplanets”, 2020IJAsB..19..136A ADS Seki, D., Otsuji, K., Ishii, T. T., et al., “SMART/SDDI Filament Disappearance Sakaue, T. & Shibata, K., “M-dwarf’s Chromosphere, Corona and Wind Con- Catalogue”, 2020arXiv200303454S ADS nection via the Nonlinear Alfvén Wave”, 2021arXiv210612752S ADS Namekata, K., Davenport, J. R. A., Morris, B. M., et al., “Temporal Evolution of Seki, D., Otsuji, K., Isobe, H., et al., “Small-scale Turbulent Motion Spatially Resolved Individual Star Spots on a Planet-hosting Solar-type Star: of the Plasma in a Solar Filament as the Precursor of Eruption”, Kepler-17”, 2020ApJ...891..103N ADS 2021arXiv210611875S ADS Shimojo, M., Kawate, T., Okamoto, T. J., et al., “Estimating the Tempera- Namekata, K., Maehara, H., Sasaki, R., et al., “Erratum: Optical and X-ray ture and Density of a Spicule from 100 GHz Data Obtained with ALMA”, observations of stellar flares on an active M dwarf AD Leonis with Seimei 2020ApJ...888L..28S ADS Telescope, SCAT, NICER, and OISTER”, 2021PASJ...73..485N ADS Tei, A., Gunár, S., Heinzel, P., et al., “IRIS Mg II Observations and Gutierrez, M. V., Otsuji, K., Asai, A., et al., “A three-dimensional ve- Non-LTE Modeling of Off-limb Spicules in a Solar Polar Coronal Hole”, locity of an erupting prominence prior to a coronal mass ejection”, 2020ApJ...888...42T ADS 2021PASJ...73..394G ADS Notsu, Y., Kowalski, A., Maehara, H.,
    [Show full text]
  • Transient Nature of J195754+353513 3
    Mon. Not. R. Astron. Soc. 000, 1–9 (2017) Printed 14 June 2021 (MN LATEX style file v2.2) Transient nature of J195754+353513 Sabyasachi Pal1⋆ Dusmanta Patra1 Monique Hollick2,3 Sandip K. Chakrabarti4,1 1Indian Centre for Space Physics, 43 Chalantika, Garia Station Road, 700084, India 2Defense Science and Technology Group, West Avenue, Edinburgh, South Australia, 5111, Australia 3University of New South Wales, Anzac Parade, Kensington, NSW, 2052, Australia 4S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata, 700098, India ABSTRACT We have searched for transient and/or variable radio sources in the field of Galactic micro-quasar Cygnus X-1 in 1.4 GHz (L band) using data from the Karl G. Jansky Very Large Array (JVLA). We used twenty years of data between 1983 and 2003. We found a source J195754+353513 showing transient behavior. The source was also mentioned earlier in NVSS and WENSS catalog but its transient nature was not reported earlier. The source is located 23.8 arcminutes far from Cygnus X-1. It is detected many times during the span of our study and it varied between less than 0.3 mJy to 201 mJy. J195754+353513 also showed high intra-day variability. In one occasion, the source rose from ∼ 20 mJy to ∼ 180 mJy 700 second. For limited number of cases circularly polarized emission could be detected from the source with V/I vary between 0.15 to 0.25. 2MASS J19575420+3535152 may be the near-infrared counterpart of the source. We compared the properties of the source with other Galactic transient sources having similar properties.
    [Show full text]
  • Bibliography from ADS File: Haisch.Bib June 27, 2021 1
    Bibliography from ADS file: haisch.bib Antunes, A., Haisch, B., & Schmitt, J. H. M. M., “ASCA observations of X-ray August 16, 2021 flares on Proxima Centauri”, 1995AAS...186.2102A ADS Haisch, B., Uchida, Y., Kosugi, T., & Hudson, H. S.: 1995, Stellar x-ray flares, Lockheed Missiles and Space Co. Report 1995lock.reptR....H ADS Haisch, B. M., Sims, M., & Lindblom, J., “The Cosmos Portal and the IYA2009 Ayres, T. R., Fleming, T. A., Simon, T., et al., “The RIASS Coro- Project”, 2009AAS...21440001H ADS nathon: Joint X-Ray and Ultraviolet Observations of Normal F–K Stars”, Haisch, B. M., Sims, M., & Lindblom, J., “The Cosmos Portal and the IYA2009 1995ApJS...96..223A ADS Project”, 2009AAS...21346508H ADS Haisch, B., Antunes, A., & Schmitt, J. H. M. M., “ASCA Observations of Solar- Haisch, B. M., Lindblom, J., & Terzian, Y., “Astronomy in the Digital Universe”, like M-flares on Proxima Centauri”, 1994AAS...185.4505H ADS 2006AAS...209.9402H ADS Schmitt, J. H. M. M., Haisch, B. M., & Drake, J. J., “A Spectroscopic Measure- Davis, E. W., Teofilo, V. L., Haisch, B., et al., “Review of Experimental Concepts ment of the Coronal Density of Procyon”, 1994Sci...265.1420S ADS for Studying the Quantum Vacuum Field”, 2006AIPC..813.1390D ADS Drake, J. J., Laming, J. M., Widing, K. G., et al., “The First Measurement of Rueda, A. & Haisch, B., “Gravity and the quantum vacuum inertia hypothesis”, Stellar Coronal Abundances: The Absence of the FIP Effect in the Corona of 2005AnP...517..479R ADS Procyon”, 1994AAS...184.0522D ADS Craig, N., Mendez, B. J., Hanisch, R.
    [Show full text]
  • Bibliography from ADS File: Giampapa.Bib June 27, 2021 1
    Bibliography from ADS file: giampapa.bib Giampapa, M. S., Andretta, V., Beeck, B., Reiners, A., & Schüssler, M., “Joint August 16, 2021 Response of the Helium Lines to Chromospheric Heating in Solar-type Stars”, 2012AAS...22020314G ADS Andretta, V. & Giampapa, M., “Estimating the Fractional Area Coverage of Guilluy, G., Andretta, V., Borsa, F., et al., “The GAPS programme at TNG. Active Regions in Dwarf Stars”, 2011ASPC..448.1111A ADS XXII. The GIARPS view of the extended helium atmosphere of HD 189733 b Fletcher, L., Hudson, H., Cauzzi, G., et al., “Splinter Session “Solar and Stellar accounting for stellar activity”, 2020A&A...639A..49G ADS Flares””, 2011ASPC..448..441F ADS Rackham, B., Apai, D., Giampapa, M., et al., “Towards Mitigating the Impact of Giampapa, M. S., “The evolution of stellar surface activity and possible effects Stellar Photospheric Heterogeneity on Precise Exoplanet Transmission Spec- on exoplanets”, 2011IAUS..273...68G ADS tra”, 2019EPSC...13..971R ADS Carpenter, K. G., Schrijver, C. J., Karovska, M., et al., “Stellar Imager (SI): Rackham, B., Pinhas, A., Apai, D., et al., “Constraining Stellar Photospheres developing and testing a predictive dynamo model for the Sun by imaging as an Essential Step for Transmission Spectroscopy of Small Exoplanets”, other stars”, 2010arXiv1011.5214C ADS 2019BAAS...51c.328R ADS Giampapa, M. S., Sherry, W. H., & Craine, E. R., “Photometric Rackham, B. V., Apai, D., & Giampapa, M. S., “The Transit Light Source Effect. Variability of Solar-Type Stars in the Young Pleiades Open Cluster”, II. The Impact of Stellar Heterogeneity on Transmission Spectra of Planets 2010AAS...21640014G ADS Orbiting Broadly Sun-like Stars”, 2019AJ....157...96R ADS Chaplin, W.
    [Show full text]
  • A Search for Laser Emission with Megawatt Thresholds from 5600 FGKM Stars
    The Astronomical Journal, 153:251 (24pp), 2017 June https://doi.org/10.3847/1538-3881/aa6d12 © 2017. The American Astronomical Society. All rights reserved. A Search for Laser Emission with Megawatt Thresholds from 5600 FGKM Stars Nathaniel K. Tellis1 and Geoffrey W. Marcy2 1 Astronomy Department, University of California, Berkeley, CA 94720, USA; [email protected] 2 Astronomy Department, University of California, Berkeley, CA 94720, USA Received 2017 February 22; revised 2017 April 8; accepted 2017 April 10; published 2017 May 12 Abstract We searched high-resolution spectra of 5600 nearby stars for emission lines that are both inconsistent with a natural origin and unresolved spatially, as would be expected from extraterrestrial optical lasers. The spectra were obtained with the Keck 10 m telescope, including light coming from within 0.5 arcsec of the star, corresponding typically to within a few to tens of astronomicalunits of the star, and covering nearly the entire visible wavelength range from 3640 to 7890 Å. We establish detection thresholds by injecting synthetic laser emission lines into our spectra and blindly analyzing them for detections. We compute flux density detection thresholds for all wavelengths and spectral types sampled. Our detection thresholds for the power of the lasers themselves range from 3 kW to 13 MW, independent of distance to the star but dependent on the competing “glare” of the spectral energy distribution of the star and on the wavelength of the laser light, launched from a benchmark, diffraction-limited 10 m class telescope. We found no such laser emission coming from the planetary region around any of the 5600 stars.
    [Show full text]
  • Blue Asymmetry in Hα Line During the Non-White Light Flare
    Time-resolved spectroscopy and photometry of an M dwarf flare star YZ Canis Minoris with OISTER and TESS: Blue asymmetry in Hα line during the non-white light flare Hiroyuki MAEHARA1 , Yuta NOTSU2,3, Kousuke NAMEKATA4 , Satoshi HONDA5, Adam F. KOWALSKI2,3,6 , Noriyuki KATOH5,7, Tomohito OHSHIMA5 , Kota IIDA8, Motoki OEDA8, Katsuhiro L. MURATA8, Masayuki YAMANAKA9,10 , Kengo TAKAGI11 , Mahito SASADA9 , Hiroshi AKITAYA9 , Kai IKUTA4, Soshi OKAMOTO4 , Daisaku NOGAMI4 and Kazunari SHIBATA12 1Subaru Telescope Okayama Branch Office, National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 3037-5 Honjo, Kamogata, Asakuchi, Okayama 719-0232, Japan 2Laboratory for Atmospheric and Space Physics, University of Colorado Boulder, 3665 Discovery Drive, Boulder, CO 80303, USA 3National Solar Observatory, University of Colorado Boulder, 3665 Discovery Drive, Boulder, CO 80303, USA. 4Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo, Kyoto 606-8502, Japan arXiv:2009.14412v2 [astro-ph.SR] 1 Oct 2020 5Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyogo, Sayo, Sayo, Hyogo 679-5313, Japan 6Department of Astrophysical and Planetary Sciences, University of Colorado Boulder, 2000 Colorado Ave, Boulder, CO 80305, USA. 7Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada-ku, Kobe, Hyogo 657-8501, Japan 8Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551, Japan 1 9Hiroshima Astrophysical Science Center,
    [Show full text]
  • Some Observational Aspects of Compact Galactic X-Ray Sources
    Cover: A two dimensional picture on the High Resolution Imager taken with the Objective Grating Spectrometer onboard the EINSTEIN observatory of the black hole candidate, the X-ray binary system Cygnus X-l. The central bright spot is the zero order image with on both sides the first order diffracted radiation extending to about 20 A (corresponding to 320 arcsec). N Grafisch bedrijf: Jurriaans B.V. Amsterdam. SOME OBSERVATIONAL ASPECTS OF COMPACT GALACTIC X-RAY SOURCES PROEFSCHRIFT TER VERKRIJGING VAN DE GRAAD VAN DOCTOR IN DE WISKUNDE EN NATUURWETENSCHAPPEN AAN DE RIJKSUNIVERSITEIT TE UTRECHT, OP GEZAG VAN DE RECTOR MAGNIFICUS PROF.DR. O.J. DE JONG, VOLGENS BESLUIT VAN HET COLLEGE VAN DECANEN IN HET OPENBAAR TE VERDEDIGEN OP WOENSDAG 15 DECEMBER 1982 DES NAMIDDAGS TE 4.15 UUR DOOR JOHAN HEISE GEBOREN OP 23 DECEMBER 1942 TE HILVERSUM PROMOTOR PROF. DR.C. DE JAGER Contents Voorwoord 8 Samenvatting 11 Summary 17 I. REVIEWS 19 1.1 Introduction 20 1.2 High Luminosity Galactic X-ray Sources 22 Transient phenomena in galactic X-ray sources 1.3.1 X-ray Burst Sources 31 1.3.2 X-rays from Flare Stars 48 1.3.3 Transient Galactic X-ray Sources 65 Low Luminosity Galactic X-ray Sources 1.4.1 X-rays from isolated Hot White Dwarfs 73 1.4.2 X-ray emission from Cataclysmic Variables 83 II. HIGH LUMINOSITY GALACTIC X-RAY SOURCES 97 11.1 ANS results on X-ray binaries 98 (J.Heise,A.C.Brinkman) 11.2 X-ray observations of Cyg X-l with ANS 1J0 (J.Heise,A.C.Brinkman,J.Schrijver, R.Mewe,A.den Boggende,E.Gronenschild, D.Parsignault,J.Grindlay,E.Schreier, H.Schnopper,H.Gursky) 11.3 High resolution soft X-ray spectra with the Objective JJ5 Grating Spectrometer of the Einstein Observatory (J.Heise,A.Brinkman) III.
    [Show full text]
  • Arxiv:Astro-Ph/0611074V1 2 Nov 2006
    Near-Ultraviolet Spectra of Flares on YZ CMi Suzanne L. Hawley1, Lucianne M. Walkowicz1, Joel C. Allred2, Jeff A. Valenti3 ABSTRACT Near-ultraviolet spectroscopic data obtained with the HST STIS instrument on the dMe flare star YZ Canis Minoris (YZ CMi) were analyzed. Flare and quiet intervals were identified from the broadband near-UV light curve, and the spectrum of each flare was separately extracted. Mg II and Fe II line profiles show similar behavior during the flares. Two large flares allowed time-resolved spectra to be analyzed, revealing a very broad component to the Mg II k line profile in at least one flare spectrum (F9b). If interpreted as a velocity, this component requires chromospheric material to be moving with FWHM ∼ 250 km sec−1, implying kinetic energy far in excess of the radiative energy. The Mg II k flare line profiles were compared to recent radiative hydrodynamic models of flare atmospheres undergoing electron beam heating. The models successfully predict red enhancements in the line profile with typical velocity of a few km sec−1, but do not reproduce the flares showing blue enhancements, or the strongly broadened line observed in flare F9b. A more complete calculation of redistribution into the line wings, including the effect of collisions with the electron beam, may resolve the origin of the excess line broadening. Subject headings: stars: low mass — stars: magnetic activity — stars: emission lines — stars: flares — stars: individual (YZ CMi) arXiv:astro-ph/0611074v1 2 Nov 2006 1. Introduction Spectroscopic signatures of flares on M dwarfs have been sporadically explored, mostly at optical wavelengths, since the pioneering observations of UV Ceti by Joy & Humason (1949).
    [Show full text]
  • National Solar Observatory (NSO)—Has Prepared Separate Quarterly Reports Which Are Included in This Packet
    NATIONAL OPTICAL ASTRONOMY OBSERVATORIES QUARTERLY REPORT January 1, 1984 - March 31, 1984 The period ending March 31, 1984, was a very active period with the formation of NOAO and several of its component parts. Each of the Observatories—Cerro Tololo Inter-American Observatory (CTIO), Kitt Peak National Observatory (KPNO), and National Solar Observatory (NSO)—has prepared separate quarterly reports which are included in this packet. Because the Advanced Development Program (ADP) was just starting up during the last month of the reporting period, a report was not required for that division. The only other units which were formed during the reporting period—the NOAO Director's Office and Central Administrative Services—are covered in the following report (Central Offices). Director's Office The NOAO Director's Office was officially established on February 1, 1984. During this first quarter efforts were centered on reorganization of the management of the three ground- based observatories—CTIO, KPNO, and NSO—and the formation of the NOAO Central Offices. Search Committees which we established for the NOAO Associate Directors/Directors of KPNO and NSO completed their separate searches and recommended candidates for the positions. Consistent with their recommendation Drs. Sidney Wolff and Robert Howard were selected by NOAO Director Jefferies, for KPNO and NSO respectively, for recommendation to the AURA Executive Committee whose approval was subsequently obtained. In addition, selections were made for the following positions: NOAO Associate Director/Director ADP, Manager Central Administrative Services/Controller, Assistant to the Director NOAO, Manager of NOAO Engineering and Technical Services, and Manager of NOAO Central Computer Services.
    [Show full text]